A　multi-magnetic　couple　magnetorheological　damper　with　full　channel　effective　damping　is　designed.　By　designing　the　magnetic　outer　ring　of　the　magnetic　couple　into　a　structure　with　gradual　cross-sectional　area,　the　purpose　of　effective　damping　of　the　full　channel　can　be　achieved,　so　that　the　entire　damping　channel　is　affected　by　the　magnetic　field.　Through　the　magnetic　circuit　simulation　analysis,　the　rationality　of　the　design　is　verified,　and　the　magnetic　induction　intensity　on　the　damping　channel　can　reach　the　theoretical　design　value,　which　reflects　the　efficient　magnetic　field　utilization　rate　of　the　damper.　©　Published　under　licence　by　IOP　Publishing　Ltd.